Chip breaker for woodworking machines



C. G. OSTEMAN.

CHIP BREAKER FOR WOODWORKING MACHINES.

APPLICATION FILED MAY 2, 1921.

Patented Jan. 24, 1922.

2 SHEETS-SHEET I.

In vewior: v CarZ G.0sZe?1-van, 213% MM I S.

C. G. OSTEMAN.

CHIP BREAKER FOR WOODWORKING MACHINES.

APPLICATION FILED MAY 2, 192:.

Patnted Jan. 24,1922.

2 SHEETS-SHEET 2.

Inveni/ or 0am? G. 0536??? 2 UNITED STATES PATENT OFFICE.

CARL OSTEMAN, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO S. A. WOODS MACHINE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

CHIP BREAKER FOR WOOD WORKING MACHINES.

Specification of Letters Patent.

Patented Jan. 24, 1922.

Application filed May 2, 1921. Serial No. 466,201.

To all whom it may concern:

Be it known that I, CARL G. OSTEMAN, a citizen of the United States, and a resident of Boston, in the county of Suffolk and State of Massachusetts, have invented an Improvement in Chip Breakers for Woodworking Machines, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to wood working machines such as planers and matchers and has more particularly to do with the construction of the chip breaker. One object of my invention is to provide means for applying a variable tension to the chip breaker. Another is to provide a construction of v chip breaker, however tensioned, which will prevent it from engaging the cutter head if unduly displaced.

My invention will best be understood by reference to the following description of an illustrative embodiment thereof shown by way of example in the accompanyingdrawings, wherein:

Fig. 1 is a partial side elevation of a planer showing such parts as are required for an understanding of my invention;

Fig. 2 is a section on the line 2-2 of Fig. 1, with parts broken away;

Fig. 3 is a section on line 33 of Fi Fig. i is an elevation of the chip breaker yoke and its supporting means as seen from the right in Figs. 1 and 3.

Referring to the drawings I have there shown a portion of the main frame orbed 3 of a planer or like machine on which is mounted the cutter head stand 5 receiving the vertically adjustable cutter head slide 7 supporting at its upper end the cutter head yoke and the top cutter head 9 the latter being indicated in dotted lines. in Fig. 1.

. In the embodiment of my invention here shown the chip breaker cooperating with the head 9 is supported by links 11 from upstanding ears 13 at the upper end of the cutter head slide, these links supporting the chip breaker yoke 15'at either side of the latter as best shown in Fig. 2. On this yoke are carried the individual shoes 17 which may be provided with rearwardly extending stems 19 by'which they are secured in the slotted members 21 vertically adjusta e .1

the cross bar of the yoke 15 as indicated in the drawings. This construction may be varied in accordance with known principles of design as may be desired.

The shoes l7 bear with considerable weight on the work passing through the ma chine but under certain circumstances it is desired to increase this force by exerting an additional tension on the chip breaker and on the other hand in the case of very light stock. it may be desirable sometimes to counterbalance the chip breaker so that the force that it will exert will be less. In the present instance means are provided for exerting a variable tension on the chip breaker either to weight or to counterbalance the same comprising mechanism received below the chip breaker proper and conveniently provision is made for adjusting the tensioning mechanism from a convenient position at the side of the main frame of the machine. In the present embodiment of my invention, best shown in Fig. 2, I provide at either side of the yoke 15 depending connecting rods 23 by which the yoke may be moved up and down. Herein the lower ends of the rods 23 are supported by arms 25 substantially parallel to the links 11 and carried on the rock shaft 27 journalled at the lower end of the cutter head slide 7. It will be understood that if the arm 25, referring to Fig. 1, is rocked clockwise adownward force will be exerted on the chip breaker shoes 17 and, on the contrary, if it is rotated counterclockwise a lifting, counterbalancing movement will be effected. Herein I have shown alever arm 29 secured to the rock shaft for operating the same, the arm 29 and the arms 25 constituting in effect a bell crank, one arm of which is secured to the connecting rods 23 and through the other arm of which force is applied.

It will be noted that the parts so far men tioned are all mounted and connected with the cutter head slide to move vertically therewith in the adjustment of the cutter head. The tension applying mechanism on the contrary is in a fixed position but is connected to the parts already described in such manner that motion due to adjustment of the cutter head slide does not substantially effect movement of the parts. Herein, as best shown in Fig. 1, a relatively long connecting link 31 connects the crank arm 29 to crank arm 33. substantially parallel thereto. in other words the arm ma 1 be designed to be strictly parallel to the arm 29 in the average median position of the lat ter due to adjustment of the cutter head slide. The arm 33 is carried by a short rock shaft 35 projecting through the side frame 3 of the machine so that adjustment of the force exerted on the cutter head is conveniently provided for exteriorly of the machine and at the side thereof.

Referring to the drawings, the rock shaft 35 is herein operated by lever 37 having the handle 39 for moving the same, the lever preferably extending on both sides of the pivotal point of the shaft 35 and means are provided for adjustably connecting, tension applying means to the lever. Herein asuitable coil spring 41 anchored at one end of the frameofthe machine is used and the other end of the spring is secured to the slide block 1 longitudinallyadjustable in the slot 45 extending along the lever, at any point of which it may be clamped in well known manner. When the block 43 is at the right of the pivotal point 35, referring to Fig; 1, the lever 37 is drawn'against a suitable stop 47 and it will be clearly seen from Fig. 1

the effect'of the operation of the spring is to exert a downward pressure on the chip breaker through the connecting rods 23 and thls pressure .Wlll vary in accordance with the position of the block 43 in the slot i5.

If the block 43 is in the line between the piv otal point 35 and the anchored end of the spring the tension of the spring will have no effect on the chip breaker which will rest on the work with its own weight. On the other hand, if the block43 is shifted to the left of the point 35 the spring will have a variable counterbalancing effect on the chip breaker, exerting a lifting force through the connecting rods 23.

For holding the chip breaker in elevated position during adjustment of the machine a pivoted latch 49 may be provided cooperat ing with the lever 37. The latch e9 is normally supported in the position shown in Fig. 1 by stop pin 51 and as seen from that figure if the lever 37 is swung up by a considerable depression of the handle 39, itwill throw up the latch 4:9 which will swing back by gravity underneath the lever and serve to hold the same in elevated position against the force of spring 41 until the lever is again elevated by means of the handle 39 and the latch 49 manually displaced.

A feature of the construction shown in the drawings is the provision of means whereby the chip breaker, whether tensioned as here shown, or otherwise is prevented from coming into contact with the cutterv head if it is accidentally displaced beyond its normal range of movement. The shoes 1TB of the chip breaker rising and falling might.

3 under certain circumstances, be unduly lifted.

and would come into contact with the cutter head. I herein providemeans whereby when a certain limited range of displacement is chip breaker yoke 15 with the members carried thereby and the suspending links 11 will be bodily shifted upwardly and toward the right on excessive movement of the yoke. To effect thisthe links 11 may 'be'connected to the ears 13 by pin and slot connections,

conveniently formed as shown by means of the transversely extending open ended slots 51 in the links hooking over the pins 53 projecting from the ears 13. Normally pin 53 rests ln'the upper end of the slot as shown and the link and pin act as if the link were mounted on an ordinary pivot suspending the cutter yoke sothat it swings in its ordinary operation through a limited are around the center 53. If, however, the shoes 17 are unduly lifted so that there would be danger of bringing them into contact with the cutter headi) I provide means. for interengaging the yoke and links so that they move as a unit and the links will slide over the pins 53,

the pins moving downwardly in the slots 51, i

and the whole chip breaker and its suspending mechanism will be shifted bodily away from the cutter head, guided diagonally by the walls of the. slots. This act-ion may be conveniently effected by providing pins 55 projectingfrom the side of the links and overhanging a portion of'the 'chip breaker yoke. The yoke normally has lost motion relative to thepins'but on excessive lifting movement of the chip breaker it'will come in contact with the pins and on further movement the links 11 will lift bodily with the chip breaker and the whole will be displaced to the right guided by the diagonally extending slot. 1

Pins'57 may be provided on the chip breaker yoke overhanging the links 11 so that as the chip breaker fallsagain-under gravity the links will be pushed downwardly to bring the pins 53 tothe upper ends of-the slots as shown in Fig. 1.. The chip breaker and links have arelative lost motion between the twopositions where the pins 55 on the one hand and the pins 57 on the other engage to interlock them for movement in one or the opposite direction, respectively.

Having thus described in detailthe' particular embodiment of'my invention shown by way of example in the accompanying drawings, the principles exemplified thereby which I claim as new and desire to secure chip breaker and means for tensioning the.

same comprising mechanism received beneath the same and adjustably operable exteriorly from the side of the machine.

8. In a machine of the class described a chip breaker and means for tensioning the same comprising a connecting rod depending therefrom and means exteriorly mounted at the side of the machine frame for applying an adjust-ably variable force to said rod.

4. In a machine of the class described alever pivoted at the side of the machine, a stop cooperating therewith, a block slidable along the lever, a tension spring connected to the block, a chip breaker and a force transmitting connection between the chip breaker and the lever.

5. In a machine of the class described a lever pivoted at the side of the machine, a stop cooperating therewith, a block slidable along the lever, a tension spring connected to the block, a catch for latching up said lever, a chip breaker and a force transmitting connection between the chip breaker and the-lever.

.6. In a machine of the class described in combination with the cutter head slide, links pivoted thereto, a chip breaker supported by said links, a connecting rod depending from the chip breaker, a bell crank on said slide having an arm connected to the rodand an adjustable tension applying means connected to said other arm.

7. In combination with a chip breaker yoke, links suspending the same and having a shiftable pivot, and means for interengaging said yoke and the links on excessive movement of the yoke to shift the pivot of the latter.

8. In combination with a chip breaker yoke, links pivoted to the same having transversely slotted ends, supports received in the slots and means whereby on excessive movement of the yoke said links are shifted by movement of said ends over the supports.

9. In combination with a chip breaker yoke, links pivoted to the same having transversely slotted ends, supports received in the slots and means for interengaging the yoke and the links on excessive lifting of the former to shift the links by movement of said ends over the supports whereby to move the yoke bodily away from the cutter head.

10. In combination with a chip breaker voke, links pivoted to the same having transversely slotted ends, support-s received in the slots, means for interengaging the yoke and the links on excessive lifting of the former to shift the links by movement of said ends over the supports whereby to move the yoke bodily away from the cutter head and means normally interengaging under gravity to cause the yoke to move said ends down over said supports.

11. In combination with a chip breaker yoke, suspension links therefor having transverse pin and slot connection with asup port, a force closure connection against downward movement of said yoke relatively to the links normally to maintain the pin in one end of the slot to serve as a pivot and a force closure connection effective on excessive upward movement of the yoke to interlock the same with the links for further up ward movement.

12. In combination with a. chip breaker yoke, suspension links therefor having transverse pin and slot connection with a support and lost motion interengaging means between said yoke and said links, effective to cause both tomove upwardly and downwardly a a unit at the extremes of such motion.

13. In combination with a chip breaker mounted for limited oscillating movement,

diagonal guide surfaces effective when thechip breaker passes an extreme of such movement to shift it bodily laterally.

In testimony whereof, I have signed my name to this specification.

CARL Gr. OSTEMAN. 

